7. Scope for future work
New critical success factors and hence new criteria that emerge (to satisfy changing
business needs), then they can be included in the AHP model to select a service provider,
even if data collection and computational problems would increase in the process. This is
one of the reasons that we suggested short-listing the number of vendors first and then
applying the AHP model. In addition, the number of success factors can be grouped to
minimize the number of criteria and sub-criteria used in formulating the AHP model.
The number of decision-makers forming an evaluation team, maybe increased to collect
more data and determine priority weights. We can conduct sensitivity analysis and
determine the optimum number of evaluators to be used to collect data. Several case
studies in the literature using the AHP’ indicate the use of three to seven evaluators
(Saaty, 1980) so that the bias of an evaluator in assessing pair wise comparisons can be
reduced. On the other hand, the use of triangle questionnaire, improved nine-point scale,
and reformative pair wise comparison judgment matrices can improve the precision of
this approach.